Particle ID Diagnostics in the MICE Beamline Paul Soler, Kenny Walaron University of Glasgow and Rutherford Appleton Laboratory MICE Collaboration Meeting June 2005.

Particle ID in beamline Particle identification in beamline for validation of beamline simulations: dE/dx for proton separation Insert slabs of scintillator upstream and downstream of solenoid for PID Scintillator: protons less than 400 MeV/c deposit >8.5 MeV/cm, while pions/muons deposit ~2 MeV/cm p, m protons Expected energy loss in scintillator dE/dx (MeV/cm) P (GeV/c) MICE Collaboration Meeting June 2005

Particle ID in beamline Segmented readout slabs, read out by double ended PMTs PMTs XP2020 or EMI 9954 Segmented BC-404 Perform test of equipment and initial validation of beamline simulation during ISIS shutdown end 2005-beginning 2006. Idea is to install equipment inside ISIS ring for test and first measurement of beamline rates and particle ID. MICE Collaboration Meeting June 2005

MICE Collaboration Meeting ISIS beam test (beg 2006) Proposed location of beam test: same angle as MICE beamline but inside synchrotron ring, at 10m or 20m from target MICE Collaboration Meeting June 2005

Simulations for beam test 10m from target 20m from target p p m p m p Air affects average momentum and dE/dx for protons. Rates are very high (~30 MHz at 10 m) Idea to add absorber to reduce proton rate: perform runs with 1- 5 cm of polyethylene and measure ratio of rates. Need to perform simulations of rates with different absorber thickness MICE Collaboration Meeting June 2005

Equipment for beam test Scintillator: Bicron BC-404 (need to purchase it in 1-2 cm slabs) Light output 68% anthracene Rise Time 0.7ns Pulse width = 2.2ns Attenuation Length (l) = 140cm PMT: XP2020 or EMI9954 (have them, need to be tested) Gain: ~3x107 at 2000V Rise time: 1.5-1.7 ns Have already acquired electronics equipment for test: CAEN V792N 12 bit Charge integrating ADC for VME: 3 Modules (48 channels) CAEN V1290N TDC for VME: 2 modules (32 channels), 25 ps LSB VME crate UNIDAQ system to read out VME Already tested system at KEK testbeam: improves TOF resolution Need to define slab width and procure scintillator and wave-guides MICE Collaboration Meeting June 2005

Equipment for beam test FAN IN/OUT Q-ADC TDC GATE HIGH VOLTAGE PMT1 PMT2 X x VME CRATE L MICE Collaboration Meeting June 2005

MICE Collaboration Meeting Extraction of signal Extract a, b constants and l from calibration data. Energy and position can be extracted from: TDC signals can give extra information but limited to sx~10 cm, due to different path lengths of photons (0.5 ns): MICE Collaboration Meeting June 2005

MICE Collaboration Meeting Conclusions PID scintillators to be used for beamline diagnostics to validate beamline simulation Perform PID system test at end 2005 inside ISIS ring at 10 m, 20 m. Particle rates high (~30 MHz at 10 m). Can use absorber materials in front of scintillator to reduce rates: 1-5 cm of polyethylene absorber. Compare rates from each of the runs for validation of beamline simulation TDC and ADC electronics purchased and already integrated into UNIDAQ for KEK testbeam Set-up system in Glasgow for testing of PMTs and scintillators to be ready at end of 2005 for beam test. Maybe good opportunity to test TOF prototype also? MICE Collaboration Meeting June 2005